package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式不正确");
        }
        //3.符合，生成验证码

        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);

        //6.返回成功信息
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式不正确");
        }

        //2.校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.toString().equals(code)) {
            //3.验证码错误
            return Result.fail("验证码错误");
        }


        //4.验证码正确，查询用户信息 select * from user where phone = ?

        User user = query().eq("phone", phone).one();


        //5.判断用户是否存在
        if (user == null) {
            //6.用户不存在，创建用户
            user = createUserWithPhone(phone);

        }
        //7.保存用户信息到redis
        //7.1随机生成token，作为登陆令牌

        String token = UUID.randomUUID().toString(true);

        //7.2将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> usermap = BeanUtil.beanToMap(userDTO);

        //7.2.1将usermap中所有属性转换为String类型，否则redis无法保存
        usermap.replaceAll((k, v)-> StrUtil.toString(v));

        //7.3保存到redis
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token, usermap);

        //7.4设置过期时间
        stringRedisTemplate.expire(LOGIN_USER_KEY+token, LOGIN_USER_TTL, TimeUnit.SECONDS);

        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1创建用户对象
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX +RandomUtil.randomNumbers(10));
        //2保存用户信息
        save(user);
        //3返回用户对象
        return user;

    }


}
